Merge pull request #30 from OpakAlex/query_dsl

Enhanced Query w/ boosting. Cool stuff
add custom_score type query
add constant_score type query
add dis_max type query
add field type query
add flt type query
add flt_field type query
add fuzzy type query
add has_child type query
add has_parent type query
add match_all type query
add span_near type query
add span not query type
add span_or query type
fix span_term query type
add terms type query
add terms type query
add top_children type query
add wildcard type query
add indices type query